Can i make a sprite bigger?

[Timo3681]

npc-4.gif is 32 x 216. if i want a bigger npc, can i change size from 32 x 216 to 64 x 432?

[RudeGuy]

yes

[Timo3681]

How can i add new emenys, blocks etc.? How can i add more things like coins? If i make a level with a Boss, how can i add fireballs to a Boss?

[Emral]

How can i add new emenys, blocks etc.? How can i add more things like coins? If i make a level with a Boss, how can i add fireballs to a Boss?

The easiest way to go about this is by replacing existing npcs and blocks. There are 600ish blocks in the game so you won't run out of space with those. There's a tutorial on custom graphics here: viewtopic.php?f=35&t=10507

Adding new npcs... becomes more of a possibility if you're willing to delve into Lunalua, SMBX2's scripting API.
If you don't want to learn coding for this, there are 7 coins in the game that are worth 1 coin, 2 worth 2 and 1 worth 20. If you need 7 or less different coins in your level, those will do.
For the fireball... it really depends on the behaviour you want from it. The fireballs spit by current bosses in the game just kinda fly in a direction and can be attached to a boss with a projectile generator. If you want any sort of AI that's not present in the base game, you'll need to code it in LunaLua.

[Timo3681]

What is with copyright, if i make graphics from other games? from games from Amiga, Commodore, SNES, Sega, Playstation etc.

[PixelPest]

There's no problem using them...as long as you don't sell them

[Timo3681]

Why have graphics black or dark borders? are dark Borders important for graphics?

[HenryRichard]

It's the style chosen for many games. Not all of them do - SMB1 has colored borders for most things, and SMB2 has dark borders on very few things - the grass tiles being the most notable IMO. It's not really important that graphics have them, but it is important that the styles aren't wildly different.

[EfeCan2599]

idk.

[kr4k1n]

idk.

idk either lol

[FireyPaperMario]

I don't even know about copyrighted graphics.

[SneakyDude]

I don't even know about copyrighted graphics.

Copyrighted GFX are either ripped from a tileset that people didn't credit, that should sum it up for ya!
EDIT: They can also be from other games and that the ripper didn't give credit to the company

[TheGamingCats]

who knows :3

remake the sprite but make it bigger lol

also don't use 1px pixels